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#!/usr/bin/python
# RPN.py - an HP11 calulator clone (sorta)
# TO DO
# make sure stack has at least 4 values after every operation
"""
__version__ = "$Revision: 1.10 $"
__date__ = "$Date: 2005/12/13 11:13:24 $"
"""
from PythonCard import dialog, model
class STACK:
''' Manages the stack (X,Y,Z, and T registers) and
the 10 memory registers (0-9) '''
def __init__(self):
''' Initialize stack and registers '''
# init stack T, Z, Y, X , top of stack is at the right side
self._emptyStack = [0.0, 0.0, 0.0, 0.0]
self._stackData = self._emptyStack
# new_data_flag is set when the first new character is entered for a value
self.clr_flag()
# create a list for all 10 Storage Registers, initialize to 0
self._mem = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
def display(self):
''' display stack and memory data '''
print "\nStack: ", self._stackData
print "Mem: ", self._mem, "\n"
def stackSize(self):
''' make sure stack has at least 4 elements '''
while len(self._stackData) < 5:
self.display()
self._stackData.insert(0,0.0)
# Stack functions
def rotate(self):
''' rotate top 4 elements of stack '''
self.stackSize()
# remove top 4 elements, then add back to stack in reverse order
self._X = self._stackData.pop()
self._Y = self._stackData.pop()
self._Z = self._stackData.pop()
self._T = self._stackData.pop()
self._stackData.append(self._X)
self._stackData.append(self._T)
self._stackData.append(self._Z)
self._stackData.append(self._Y)
def push(self, value):
''' add value to top of stack '''
self._stackData.append(float(value))
def pop(self):
''' remove and return top of stack - X '''
self.stackSize()
return self._stackData.pop()
def readX(self):
''' return the top of stack, X, no change to stack '''
return self._stackData[-1:][0]
def swap(self):
''' swap X and Y '''
self.stackSize()
self._X = self._stackData.pop()
self._Y = self._stackData.pop()
self._stackData.append(self._X)
self._stackData.append(self._Y)
def add(self):
''' X = X + Y '''
self.stackSize()
self._stackData.append(self._stackData.pop() + self._stackData.pop())
def subtract(self):
''' X = Y - X '''
self.stackSize()
self._stackData.append( - (self._stackData.pop()) + self._stackData.pop())
def multiply(self):
''' X = X * Y '''
self.stackSize()
self._stackData.append(self._stackData.pop() * self._stackData.pop())
def divide(self):
''' X = Y / X '''
self.stackSize()
self._X = self._stackData.pop()
self._Y = self._stackData.pop()
if self._X != 0.0:
self._X = self._Y / self._X
else:
self._X = None
self._stackData.append(self._X)
# memory operations
def SetReg(self, reg, value):
''' write value into memory register reg'''
if (reg == int(reg) and (reg >= 0) and (reg <=9)):
self._mem[int(reg)] = value
else:
print "Error - invalid register"
def GetReg(self, reg):
''' read memory register reg '''
if (reg == int(reg) and (reg >= 0) and (reg <=9)):
return self._mem[int(reg)]
else:
print "Error - invalid register"
return None
# These functions operate on the new_data_flag
# Ehe flag is set when new data is entered into the
# text entry box, before the 'Enter' key is pressed
def set_flag(self): self.new_data_flag = 1
def clr_flag(self):
self.new_data_flag = 0
def get_flag(self): return self.new_data_flag
class RPN(model.Background):
''' RPN Calculator '''
def on_initialize(self, event):
# can't use a variable named self.stack
# because that would conflict with self.stack defined in the Background class
self._stack = STACK()
# menu functions
def on_menuHelpAbout_select(self, event):
try:
self.readme = open('RPN.about.txt').read()
except IOError:
self.readme = 'RPN.about.txt not found'
dlg = dialog.ScrolledMessageDialog(self, self.readme, 'About RPN Calc ...')
def on_menuHelpContents_select(self, event):
try:
self.readme = open('RPN.help.txt').read()
except IOError:
self.readme = 'RPN.help.txt not found'
dlg = dialog.ScrolledMessageDialog(self, self.readme, 'RPN Calc Help ...')
# operation buttons
def on_EnterBtn_mouseClick(self, event):
try:
self._stack.push(self.components.result.text)
# update display to float
self.components.result.text = str(self._stack.readX())
except ValueError:
print "ERROR - invalid number"
self.components.result.text = "ERROR"
self._stack.clr_flag()
self._stack.display()
def on_InvertBtn_mouseClick(self, event):
self.storeX()
# don't divide by zero
if self._stack.readX != 0:
self._stack.push( 1 / self._stack.pop() )
else:
self.stack.pop()
self._stack.push(None)
self.components.result.text = str(self._stack.readX())
self._stack.display()
def on_ROTBtn_mouseClick(self, event):
self.storeX()
self._stack.rotate()
# put X back into the result box
self.components.result.text = str(self._stack.readX())
self._stack.display()
def on_SwapBtn_mouseClick(self, event):
self.storeX()
self._stack.swap()
# put X back into the result box
self.components.result.text = str(self._stack.readX())
self._stack.display()
def on_BackBtn_mouseClick(self, event):
if self._stack.get_flag() == 1:
# remove the last entry and stuff back into result
self.components.result.text = self.components.result.text[:-1]
# self.components.result.text = str(self._stack.X)
def on_PlusBtn_mouseClick(self, event):
self.storeX()
self._stack.add()
# put X back into the result box
self.components.result.text = str(self._stack.readX())
self._stack.display()
def on_MinusBtn_mouseClick(self, event):
self.storeX()
self._stack.subtract()
# put X back into the result box
self.components.result.text = str(self._stack.readX())
self._stack.display()
def on_MultiplyBtn_mouseClick(self, event):
self.storeX()
self._stack.multiply()
# put X back into the result box
self.components.result.text = str(self._stack.readX())
self._stack.display()
def on_DivideBtn_mouseClick(self, event):
self.storeX()
self._stack.divide()
# read the X register to see if operation OK
self._result = self._stack.readX()
if self._result is not None:
self.components.result.text = str(self._result)
else:
self.components.result.text = "Divide by Zero Error"
self._stack.display()
def on_CHSBtn_mouseClick(self, event):
# make sure that X has most recent data
if self._stack.get_flag() == 1:
self._stack.push (float( self.components.result.text ))
self._stack.push( -1.0 * self._stack.pop() )
self.components.result.text = str(self._stack.readX())
self._stack.display()
# storage register operations
def on_STOBtn_mouseClick(self, event):
self.storeX()
# pop the X and Y values for the register and the value to write
self._mem = self._stack.pop()
self._value = self._stack.pop()
# is the register a valid integer value?
if (self._mem == int(self._mem) and (self._mem >= 0) and (self._mem <=9 )):
# write value to register
self._stack.SetReg(self._mem, self._value)
else:
# register is a non-integer
print "ERROR - Non-integer value given for register"
self._stack.display()
def on_RCLBtn_mouseClick(self, event):
self.storeX()
self._stack.clr_flag()
self._mem = self._stack.pop()
if(self._mem == int(self._mem) and (self._mem >= 0) and (self._mem <=9 )):
self._stack.push(self._stack.GetReg(self._mem))
self.components.result.text = str(self._stack.readX())
else:
print "ERROR - Non-integer value given for register"
return
self._stack.display()
# misc
def add_digit(self, new_value):
''' add a new digit to the result window '''
# start at 0 after an operation (+-*/ or Enter)
if self._stack.get_flag() == 1:
self.components.result.text = self.components.result.text + new_value
elif self._stack.get_flag() == 0:
self.components.result.text = new_value
self._stack.set_flag()
def storeX(self):
''' If new number has been entered, push it onto the stack '''
# if necessary, push data onto stack
if self._stack.get_flag() == 1:
self._stack.push(self.components.result.text)
self._stack.clr_flag()
# calculator digit buttons (and the decimal '.')
def on_0Btn_mouseClick(self, event): self.add_digit('0')
def on_1Btn_mouseClick(self, event): self.add_digit('1')
def on_2Btn_mouseClick(self, event): self.add_digit('2')
def on_3Btn_mouseClick(self, event): self.add_digit('3')
def on_4Btn_mouseClick(self, event): self.add_digit('4')
def on_5Btn_mouseClick(self, event): self.add_digit('5')
def on_6Btn_mouseClick(self, event): self.add_digit('6')
def on_7Btn_mouseClick(self, event): self.add_digit('7')
def on_8Btn_mouseClick(self, event): self.add_digit('8')
def on_9Btn_mouseClick(self, event): self.add_digit('9')
def on_DecimalBtn_mouseClick(self, event): self.add_digit('.')
if __name__ == '__main__':
app = model.Application(RPN)
app.MainLoop()
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